Edit report at https://bugs.php.net/bug.php?id=48770&edit=1
ID: 48770
Comment by: tyr...@php.net
Reported by: lumeet at yahoo dot com
Summary: call_user_func_array() fails to call parent from
inheriting class
Status: Verified
Type: Bug
Package: Scripting Engine problem
Operating System: *
PHP Version: 5.3, 6 (2009-08-01)
Block user comment: N
Private report: N
New Comment:
for the record: the segfault is caused by an infinite recursion (B->func), and
that happens, because the $this in the B->func() points to C, which causes
parent::func to point to itself.
btw. I find it really unintentional that call_user_func can be used with both
passing an object instance and a static call reference as a method name.
we also have failing tests for this particular bug:
Zend/tests/bug48770.phpt
Zend/tests/bug48770_2.phpt
Zend/tests/bug48770_3.phpt
imo as we have this behavior for some time now, I think we should keep it, and
update the tests.
Tyrael
Previous Comments:
------------------------------------------------------------------------
[2009-09-25 12:12:12] dmitry dot revenko at businessmedia dot ru
I'm sorry.
The solution is:
call_user_func_array('parent::func', $args);
instead of
call_user_func_array(array($this, 'parent::func'), $args);
------------------------------------------------------------------------
[2009-09-25 08:08:07] dmitry dot revenko at businessmedia dot ru
I also used this pattern in some critical moments, and it proved to be very
useful.
Yes, I know about PHP 3's "call_user_func() now propagates $this even if the
callee is the parent class". But I don't know - why? Why so simple working
logic was ruined in new version? Isn't it straght that
call_user_func_array(array( $this, 'parent::func' ), $args) should call first
found parent method func?
------------------------------------------------------------------------
[2009-08-01 01:51:07] j...@php.net
Also note: This works fine with PHP_5_2 :)
------------------------------------------------------------------------
[2009-07-02 07:38:03] sjoerd-php at linuxonly dot nl
Thank you for your bug report. I could reproduce it and added some more data:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7d03b80 (LWP 6726)]
0x082dee15 in zend_is_callable_ex (callable=0x9e3cdc0, object_ptr=0x0,
check_flags=0, callable_name=0x0, callable_name_len=0x0, fcc=0xbf49d190,
error=0xbf49d0e8) at /home/sjoerd/dev/php/trunk/php5/Zend/zend_API.c:2624
2624 {
#0 0x082dee15 in zend_is_callable_ex (callable=0x9e3cdc0, object_ptr=0x0,
check_flags=0, callable_name=0x0, callable_name_len=0x0, fcc=0xbf49d190,
error=0xbf49d0e8) at /home/sjoerd/dev/php/trunk/php5/Zend/zend_API.c:2624
#1 0x082df489 in zend_fcall_info_init (callable=0x9e3cdc0, check_flags=0,
fci=0xbf49d16c, fcc=0xbf49d190, callable_name=0x0, error=0xbf49d0e8)
at /home/sjoerd/dev/php/trunk/php5/Zend/zend_API.c:2858
#2 0x082e35a2 in zend_parse_va_args (num_args=2, type_spec=0x85b0091 "a/",
va=0xbf49d13c, flags=0)
at /home/sjoerd/dev/php/trunk/php5/Zend/zend_API.c:592
#3 0x082e3d12 in zend_parse_parameters (num_args=2, type_spec=0xbf49d0e8 "")
at /home/sjoerd/dev/php/trunk/php5/Zend/zend_API.c:870
#4 0x08220dd1 in zif_call_user_func_array (ht=2, return_value=0x9e3ce7c,
return_value_ptr=0x0, this_ptr=0x0, return_value_used=0)
at /home/sjoerd/dev/php/trunk/php5/ext/standard/basic_functions.c:4748
#5 0x083259b9 in zend_do_fcall_common_helper_SPEC (execute_data=0x9de07bc)
at /home/sjoerd/dev/php/trunk/php5/Zend/zend_vm_execute.h:313
#6 0x08302dbe in execute (op_array=0x9448e90)
at /home/sjoerd/dev/php/trunk/php5/Zend/zend_vm_execute.h:104
#7 0x082d0c77 in zend_call_function (fci=0xbf49d37c, fci_cache=0xbf49d3a0)
at /home/sjoerd/dev/php/trunk/php5/Zend/zend_execute_API.c:936
#8 0x08220df7 in zif_call_user_func_array (ht=2, return_value=0x9e3ccb0,
return_value_ptr=0x0, this_ptr=0x0, return_value_used=0)
at /home/sjoerd/dev/php/trunk/php5/ext/standard/basic_functions.c:4755
#9 0x083259b9 in zend_do_fcall_common_helper_SPEC (execute_data=0x9de06fc)
at /home/sjoerd/dev/php/trunk/php5/Zend/zend_vm_execute.h:313
#10 0x08302dbe in execute (op_array=0x9448e90)
at /home/sjoerd/dev/php/trunk/php5/Zend/zend_vm_execute.h:104
#11 0x082d0c77 in zend_call_function (fci=0xbf49d58c, fci_cache=0xbf49d5b0)
at /home/sjoerd/dev/php/trunk/php5/Zend/zend_execute_API.c:936
#12 0x08220df7 in zif_call_user_func_array (ht=2, return_value=0x9e3cae4,
return_value_ptr=0x0, this_ptr=0x0, return_value_used=0)
at /home/sjoerd/dev/php/trunk/php5/ext/standard/basic_functions.c:4755
...
#11213 0x083259b9 in zend_do_fcall_common_helper_SPEC (execute_data=0x9c1d004)
at /home/sjoerd/dev/php/trunk/php5/Zend/zend_vm_execute.h:313
#11214 0x08302dbe in execute (op_array=0x9448e90)
at /home/sjoerd/dev/php/trunk/php5/Zend/zend_vm_execute.h:104
#11215 0x082d0c77 in zend_call_function (fci=0xbf60669c, fci_cache=0xbf6066c0)
at /home/sjoerd/dev/php/trunk/php5/Zend/zend_execute_API.c:936
#11216 0x08220df7 in zif_call_user_func_array (ht=2, return_value=0x9c822d4,
return_value_ptr=0x0, this_ptr=0x0, return_value_used=0)
at /home/sjoerd/dev/php/trunk/php5/ext/standard/basic_functions.c:4755
#11217 0x083259b9 in zend_do_fcall_common_helper_SPEC (execute_data=0x9c1cf44)
at /home/sjoerd/dev/php/trunk/php5/Zend/zend_vm_execute.h:313
#11218 0x08302dbe in execute (op_array=0x9448e90)
at /home/sjoerd/dev/php/trunk/php5/Zend/zend_vm_execute.h:104
etc. etc.
------------------------------------------------------------------------
[2009-07-02 07:28:31] lumeet at yahoo dot com
Description:
------------
When class C extends B, which extends A, calls from B to its parent
methods fail when using call_user_func_array(). Using parent::func()
works just fine.
Reproduce code:
---------------
class A {
function func( $str ) {
echo $str;
}
}
class B extends A {
public function func( $str ) {
call_user_func_array( array( $this, 'parent::func' ), array( $str ) );
}
}
class C extends B {
public function func( $str ) {
parent::func( $str );
}
}
$c = new C;
$c->func( 'This should work!' );
Expected result:
----------------
The code should output "This should work!".
Actual result:
--------------
PHP crashes with backtrace (yes, only one line):
Function Arg 1 Arg 2 Arg 3 Source
php5ts!zend_is_callable_ex+61e 011f0780 00000006 003228e0
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=48770&edit=1
